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Vitamin D-Binding Protein
Specialistalso dbp, gc-globulin
What it isA liver-made carrier protein that binds vitamin D metabolites in circulation, parallel to how SHBG binds sex hormones.
DoesBuffers vitamin D availability to tissues.
GoodA mid-range DBP allows free and bound vitamin D to coexist in healthy balance.
BadGenetic variation in DBP affects bioavailable vitamin D and explains why some people benefit from vitamin D supplementation more than others.
- Standard
- 168–533 µg/mL.
- Optimal
- No widely-accepted optimal
- Modifiers
- Genetic; rises with estrogen.
How to optimize
- Lifestyle
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- Diet
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- Supplements
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- Peptides
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- Drugs
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Reference ranges are general adult lab norms; optimal ranges are editorial picks from the longevity literature — not medical advice. Always interpret results with your physician.
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